I have been waiting to here news of the DAC and have put off purchasing something else like the Sabre 32 based Eastern Electric, Audio GD's etc.

Any news Anthony?

Hi Willie

The SmartDAC has been completed and we are now working to finish off the touch panel interface for the SD.
The SmartDAC will be made available for sale with and without the interface board.
Currently I am using the SmartDAC without the interface front panel as shown below in the photo.
It has the Infrared receiver mounted directly onto the main PCB and the quadrature controller on the right handles the digital volume and input selection and of course a Universal remote control handles all of the above.

You can purchase right now a SmartDAC without the front panel interface
But with the Infrared and Quadrature controller as shown and it will also come with a universal remote control pre-programmed to control the SmartDac. The cost of this option is $800.00AUD plus postage of $30.00AUD.

Without putting a to fine a point on it.
Its sound bloody amazing!
We used my Logitec Squeezebox as the music source and tried out the SDAC on the Optical and SPDIF outs of the Squeezebox.
The performance increase was overwhelmingly obvious. The sound stage opened up like I had never heard it before.
Some of the music we listen to was Norah Jones, both Mikeís and my jaw dropped to the ground with how great it sounded.
My wife came in at this moment and her emediate response was ď itís just like been there in the Club, sitting two tables from the front of the stage, you can hear her breathing into the microphone and with all of the layers of other instruments. Itís so realĒ
So suffice to say we are very happy with the sound quality and as you would expect from this device, the sound comes from an inky black background of no noise at all.

I'd like to use this as a digital preamp with one of your amplifier kits. The source will be USB2.0 with CUDA FIR processing. Everything will be controlled via PC, so an additional interface isn't important for my application. Any ideas on final cost without the interface?

How much better is the performance with isolated optical connections compared to USB2.0?

__________________
"It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."

I'd like to use this as a digital preamp with one of your amplifier kits. The source will be USB2.0 with CUDA FIR processing. Everything will be controlled via PC, so an additional interface isn't important for my application. Any ideas on final cost without the interface?

How much better is the performance with isolated optical connections compared to USB2.0?

Hi thadman

Sorry for the late reply, I forgot to get back to you...

The SD in its current form does not stream audio from the USB port.
This is currently been used for software updates only.
This function needs further software development before this option will become available.
Mike who is developing the software is currently out of the country for about a month, so this has placed the SD on hold for the moment.

Actual audio performance between the USB and Optical is much the same.

We had built 10 units of the current SD and we just need to finish the boot loader, before they will be released as the DIY version without the touch panel interface. it will however they will come with details on how to add LED
interface.

Will this DAC decode the FLAC format ... or would a PC be used to send via SPDIF. I kinda wonder if the PC converting FLAC into the SPDIF protocol would be any less clean than having the DAC decode FLAC directly. Does anyone know if this would somehow result in a loss of audio info?

1.
Refer to the block diagram in SRC4392 datasheet at page 40. How do we know how much of X*Fs will gonna be (assumed that RXCKOD is set to be divide by 1)?

The information of PLL2 in datasheet, is unclear for me, stated that
" .... The available PLL2 output clock rates include 512fS, 256fS, and 128fS. The maximum available PLL2 output clock rate for a given input sampling rate is estimated by internal logic and made available for readback via status register 0x13."

We can read the maximum available o/p clock rate at register 0x13 and in term of maximum avialable it sound like we don't know the exact clock rate. For example1, if the status register 0x13 is 512*Fs (suppose to be maximum available) so the o/p clock rate can be 512*Fs or 256*Fs or 128*Fs. For example2, if the status register 0x13 is 128*Fs I'm exactly know that the o/p clock rate must be 128*Fs, right?

Could you please elaborate about my questin on above?

2.
The layout that you posted previously. You split the clock signal from oscillator to SRC4392 and PCM1792, I would like to guest you used 24.576MHz? I seems if the soucre is not 48Khz, 96KHz, and 192KHz then it will be upsampling to be these rate. For example, in = 44.1kHz out = range of 48kHz to 192KHz (upto the setting) ?